mirror of
https://github.com/aseprite/aseprite.git
synced 2025-01-14 03:40:55 +00:00
295 lines
8.3 KiB
C
295 lines
8.3 KiB
C
/*****************************************************************************
|
|
* "Gif-Lib" - Yet another gif library. *
|
|
* *
|
|
* Written by: Gershon Elber Ver 0.1, Jun. 1991 *
|
|
******************************************************************************
|
|
* Program to convert 24bits RGB files to GIF format. *
|
|
* Options: *
|
|
* -q : quiet printing mode. *
|
|
* -c #colors : in power of two, i.e. 7 will allow upto 128 colors in output. *
|
|
* -1 : one file holding RGBRGB.. triples of bytes *
|
|
* -s Width Height : specifies size of raw image. *
|
|
* -h : on-line help. *
|
|
******************************************************************************
|
|
* History: *
|
|
* 15 Jun 91 - Version 1.0 by Gershon Elber. *
|
|
*****************************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#ifdef __MSDOS__
|
|
#include <graphics.h>
|
|
#include <stdlib.h>
|
|
#include <alloc.h>
|
|
#include <io.h>
|
|
#include <dos.h>
|
|
#include <bios.h>
|
|
#endif /* __MSDOS__ */
|
|
|
|
#ifndef __MSDOS__
|
|
#include <stdlib.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
#ifdef HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif /* HAVE_FCNTL_H */
|
|
#include "gif_lib.h"
|
|
#include "getarg.h"
|
|
|
|
#define PROGRAM_NAME "RGB2Gif"
|
|
|
|
#ifdef __MSDOS__
|
|
extern unsigned int
|
|
_stklen = 16384; /* Increase default stack size. */
|
|
#endif /* __MSDOS__ */
|
|
|
|
#ifdef SYSV
|
|
static char *VersionStr =
|
|
"Gif toolkit module,\t\tGershon Elber\n\
|
|
(C) Copyright 1989 Gershon Elber.\n";
|
|
static char
|
|
*CtrlStr = "RGB2Gif q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
|
|
#else
|
|
static char
|
|
*VersionStr =
|
|
PROGRAM_NAME
|
|
GIF_LIB_VERSION
|
|
" Gershon Elber, "
|
|
__DATE__ ", " __TIME__ "\n"
|
|
"(C) Copyright 1989 Gershon Elber.\n";
|
|
static char
|
|
*CtrlStr =
|
|
PROGRAM_NAME
|
|
" q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
|
|
#endif /* SYSV */
|
|
|
|
/* Make some variables global, so we could access them faster: */
|
|
static int
|
|
ColorFlag = FALSE,
|
|
ExpNumOfColors = 8,
|
|
OneFileFlag = FALSE,
|
|
HelpFlag = FALSE,
|
|
ColorMapSize = 256;
|
|
|
|
static void LoadRGB(char *FileName,
|
|
int OneFileFlag,
|
|
GifByteType **RedBuffer,
|
|
GifByteType **GreenBuffer,
|
|
GifByteType **BlueBuffer,
|
|
int Width, int Height);
|
|
static void SaveGif(GifByteType *OutputBuffer,
|
|
ColorMapObject *OutputColorMap,
|
|
int ExpColorMapSize, int Width, int Height);
|
|
static void QuitGifError(GifFileType *GifFile);
|
|
|
|
/******************************************************************************
|
|
* Interpret the command line and scan the given GIF file. *
|
|
******************************************************************************/
|
|
int main(int argc, char **argv)
|
|
{
|
|
int Error, NumFiles, Width, Height, SizeFlag;
|
|
char **FileName = NULL;
|
|
GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL,
|
|
*OutputBuffer = NULL;
|
|
ColorMapObject *OutputColorMap = NULL;
|
|
|
|
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
|
|
&ColorFlag, &ExpNumOfColors, &OneFileFlag,
|
|
&SizeFlag, &Width, &Height, &HelpFlag,
|
|
&NumFiles, &FileName)) != FALSE ||
|
|
(NumFiles > 1 && !HelpFlag)) {
|
|
if (Error)
|
|
GAPrintErrMsg(Error);
|
|
else if (NumFiles > 1)
|
|
GIF_MESSAGE("Error in command line parsing - one GIF file please.");
|
|
GAPrintHowTo(CtrlStr);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (HelpFlag) {
|
|
fprintf(stderr, VersionStr);
|
|
GAPrintHowTo(CtrlStr);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
ColorMapSize = 1 << ExpNumOfColors;
|
|
|
|
if (NumFiles == 1) {
|
|
LoadRGB(*FileName, OneFileFlag,
|
|
&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
|
|
}
|
|
else {
|
|
LoadRGB(NULL, OneFileFlag,
|
|
&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
|
|
}
|
|
|
|
if ((OutputColorMap = MakeMapObject(ColorMapSize, NULL)) == NULL ||
|
|
(OutputBuffer = (GifByteType *) malloc(Width * Height *
|
|
sizeof(GifByteType))) == NULL)
|
|
GIF_EXIT("Failed to allocate memory required, aborted.");
|
|
|
|
if (QuantizeBuffer(Width, Height, &ColorMapSize,
|
|
RedBuffer, GreenBuffer, BlueBuffer,
|
|
OutputBuffer, OutputColorMap->Colors) == GIF_ERROR)
|
|
QuitGifError(NULL);
|
|
free((char *) RedBuffer);
|
|
free((char *) GreenBuffer);
|
|
free((char *) BlueBuffer);
|
|
|
|
SaveGif(OutputBuffer, OutputColorMap, ExpNumOfColors, Width, Height);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Load RGB file into internal frame buffer. *
|
|
******************************************************************************/
|
|
static void LoadRGB(char *FileName,
|
|
int OneFileFlag,
|
|
GifByteType **RedBuffer,
|
|
GifByteType **GreenBuffer,
|
|
GifByteType **BlueBuffer,
|
|
int Width, int Height)
|
|
{
|
|
int i, j;
|
|
unsigned long Size;
|
|
GifByteType *RedP, *GreenP, *BlueP;
|
|
FILE *f[3];
|
|
|
|
Size = ((long) Width) * Height * sizeof(GifByteType);
|
|
#ifdef __MSDOS__
|
|
if (Size > 65500L)
|
|
GIF_EXIT("Can't allocate more than 64k.");
|
|
#endif /* __MSDOS__ */
|
|
|
|
if ((*RedBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
|
|
(*GreenBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
|
|
(*BlueBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL)
|
|
GIF_EXIT("Failed to allocate memory required, aborted.");
|
|
|
|
RedP = *RedBuffer;
|
|
GreenP = *GreenBuffer;
|
|
BlueP = *BlueBuffer;
|
|
|
|
if (FileName != NULL) {
|
|
char OneFileName[80];
|
|
|
|
if (OneFileFlag) {
|
|
if ((f[0] = fopen(FileName, "rb")) == NULL)
|
|
GIF_EXIT("Can't open input file name.");
|
|
}
|
|
else {
|
|
static char *Postfixes[] = { ".R", ".G", ".B" };
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
strcpy(OneFileName, FileName);
|
|
strcat(OneFileName, Postfixes[i]);
|
|
|
|
if ((f[i] = fopen(OneFileName, "rb")) == NULL)
|
|
GIF_EXIT("Can't open input file name.");
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
OneFileFlag = TRUE;
|
|
|
|
#ifdef __MSDOS__
|
|
setmode(0, O_BINARY);
|
|
#endif /* __MSDOS__ */
|
|
|
|
f[0] = stdin;
|
|
}
|
|
|
|
GifQprintf("\n%s: RGB image: ", PROGRAM_NAME);
|
|
|
|
if (OneFileFlag) {
|
|
GifByteType *Buffer, *BufferP;
|
|
|
|
if ((Buffer = (GifByteType *) malloc(Width * 3)) == NULL)
|
|
GIF_EXIT("Failed to allocate memory required, aborted.");
|
|
|
|
for (i = 0; i < Height; i++) {
|
|
GifQprintf("\b\b\b\b%-4d", i);
|
|
if (fread(Buffer, Width * 3, 1, f[0]) != 1)
|
|
GIF_EXIT("Input file(s) terminated prematurly.");
|
|
for (j = 0, BufferP = Buffer; j < Width; j++) {
|
|
*RedP++ = *BufferP++;
|
|
*GreenP++ = *BufferP++;
|
|
*BlueP++ = *BufferP++;
|
|
}
|
|
}
|
|
|
|
free((char *) Buffer);
|
|
fclose(f[0]);
|
|
}
|
|
else {
|
|
for (i = 0; i < Height; i++) {
|
|
GifQprintf("\b\b\b\b%-4d", i);
|
|
if (fread(RedP, Width, 1, f[0]) != 1 ||
|
|
fread(GreenP, Width, 1, f[1]) != 1 ||
|
|
fread(BlueP, Width, 1, f[2]) != 1)
|
|
GIF_EXIT("Input file(s) terminated prematurly.");
|
|
RedP += Width;
|
|
GreenP += Width;
|
|
BlueP += Width;
|
|
}
|
|
|
|
fclose(f[0]);
|
|
fclose(f[1]);
|
|
fclose(f[2]);
|
|
}
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Save the GIF resulting image. *
|
|
******************************************************************************/
|
|
static void SaveGif(GifByteType *OutputBuffer,
|
|
ColorMapObject *OutputColorMap,
|
|
int ExpColorMapSize, int Width, int Height)
|
|
{
|
|
int i;
|
|
GifFileType *GifFile;
|
|
GifByteType *Ptr = OutputBuffer;
|
|
|
|
/* Open stdout for the output file: */
|
|
if ((GifFile = EGifOpenFileHandle(1)) == NULL)
|
|
QuitGifError(GifFile);
|
|
|
|
if (EGifPutScreenDesc(GifFile,
|
|
Width, Height, ExpColorMapSize, 0,
|
|
OutputColorMap) == GIF_ERROR ||
|
|
EGifPutImageDesc(GifFile,
|
|
0, 0, Width, Height, FALSE, NULL) ==
|
|
GIF_ERROR)
|
|
QuitGifError(GifFile);
|
|
|
|
GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ",
|
|
PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top,
|
|
GifFile->Image.Width, GifFile->Image.Height);
|
|
|
|
for (i = 0; i < Height; i++) {
|
|
if (EGifPutLine(GifFile, Ptr, Width) == GIF_ERROR)
|
|
QuitGifError(GifFile);
|
|
GifQprintf("\b\b\b\b%-4d", Height - i - 1);
|
|
|
|
Ptr += Width;
|
|
}
|
|
|
|
if (EGifCloseFile(GifFile) == GIF_ERROR)
|
|
QuitGifError(GifFile);
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Close output file (if open), and exit. *
|
|
******************************************************************************/
|
|
static void QuitGifError(GifFileType *GifFile)
|
|
{
|
|
PrintGifError();
|
|
if (GifFile != NULL) EGifCloseFile(GifFile);
|
|
exit(EXIT_FAILURE);
|
|
}
|